Modular chair



FIG. 1 is a perspective view of the chair;

FIG. 2 is a plan view of the chair;

FIG. 3 is a front view of the chair;

FIG. 4 is a rear view of the chair;

FIG. 5 is a left end view of the chair; and,

FIG. 6 is a right end view of the chair.

The ornamental design for a modular chair, as shown and described.